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Ruapehu volcano (New Zealand): increased crater lake temerature and seismic activity

Wed, 17 Apr 2019, 22:10
22:10 PM | BY: LEO
The Ruapehu crater lake during winter. (image: GNS Science)
The Ruapehu crater lake during winter. (image: GNS Science)
Another phase of increased crater lake temperatures has been recorded at the Te Wai ā-moe (Crater Lake) Mt Ruapehu in combination with moderate levels of volcanic tremor.

For the last 10 years temperatures of the summit crater lake have cycled between ~15 and 45°C over 12 month periods. Since September 2018 lake temperatures have remained at ~30°C. Over the past two weeks the temperatures have risen again at a rate of 0.5°C per day, to 42°C on April 9. Consistant with previous periods heating cycles a moderate volcanic tremor has accompanied this rise in temperature.

Previously, eruptions have been observed to occur more frequently when the lake temperature exceed 45°C, although this was not the case in 2016 when a temperature of 46°C was observed with no eruption.

Both the Volcanic Alert Level (level 1) and Aviation Code (Green) remain unchanged.

Previous news

Wed, 10 Apr 2019, 06:00

Ruapehu volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 10 April-16 April 2019 (Continuing Activity)

GeoNet reported that, at least for the last 10 years of continuous lake-temperature monitoring, heating cycles at Ruapehu's summit Crater Lake have occurred over periods of about 12 months with temperatures ranging from 15 to 45 degrees Celsius. However, the temperature remained elevated at 30 degrees for a period of six months starting in September 2018. GeoNet noted that during the previous two weeks the lake temperature increased further, at a rate of around a half of a degree per day, to 42 degrees on 9 April. ... Read all
Wed, 6 Jun 2018, 06:00

Ruapehu volcano (North Island, New Zealand) - Smithsonian / USGS Weekly Volcanic Activity Report for 6 June-12 June 2018 (New Activity / Unrest)

On 5 June GeoNet reported that a new heating cycle at Ruapehu's summit Crater Lake began, as indicated by a recent rise in the water temperature. The increasing lake temperature began 29 May, at a rate of about 1°C per day. Volcanic tremor also increased, representing a greater flow of hydrothermal fluids into the lake. ... Read all
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Ruapehu volcano sat by (c) Google Earth View
Ruapehu volcano sat by (c) Google Earth View
Ruapehu volcano
Stratovolcano 2797 m / 9,176 ft
North Island (New Zealand), -39.28°S / 175.57°E
Current status: normal or dormant (1 out of 5) Ruapehu volcano eruptions:

Typical eruption style
Mildly explosive, formation of lahars
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